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    <script>
      function Person() {
        // this = {};//
        this.name = "jack";
        this.age = 20;
        // this.__proto__= Person.prototype
        // return this // 1011
      }
      Person.prototype.say = function () {};

      /*
        ① new Person()
      */

      const p1 = new Person();
      const p2 = new Person();
    </script>
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